Enhanced efficiency fertilizer with urease inhibitor and nitrification separated within the same particle

Patent metadata

Field	Value
Publication number	US-11802097-B2
Application number	US-202217694413-A
Country	US
Kind code	B2
Filing date	Mar 14, 2022
Priority date	Apr 19, 2017
Publication date	Oct 31, 2023
Grant date	Oct 31, 2023

Abstract

Fertilizer particles with urease inhibitors and nitrification inhibitors are described herein. The fertilizer particles can include a core particle comprising a urease inhibitor and an outer layer comprising a nitrification inhibitor.

First claim

The invention claimed is:

1. A fertilizer particle comprising a shell in contact with an outer surface of a core, the fertilizer particle comprising:
a nitrification inhibitor;
a urease inhibitor; and
a nitrogen fertilizer,

wherein the nitrification inhibitor and urease inhibitor are separated in the fertilizer particle, and wherein the shell comprises no nitrification inhibitor.

2. The fertilizer particle of claim 1 , wherein the nitrification inhibitor is dicyandiamide, 3,4-dimethylpyrazole phosphate, thiourea, 2-chloro-6-(trichloromethyl)-pyridine, 5-ethoxy-3-trichloromethyl-1,2,4-thiadiazole, 2-amino-4-chloro-6-methyl-pyrimidine, 2-mercapto-benzothiazole, or 2-sulfanimalamidothiazole, or a combination thereof.

3. The fertilizer particle of claim 1 , wherein the urease inhibitor is N-(n-butyl) thiophosphoric triamide, or phenyl phosphorodiamidate, or a combination thereof.

4. The fertilizer particle of claim 1 , wherein the fertilizer particle further comprises a binder, a filler, or a pH buffering agent, or a combination thereof.

5. The fertilizer particle of claim 4 , wherein the binder comprises plaster of paris, flour, biodegradable bleached wheat flour, starch, gluten, kaolin, bentonite, or colloidal silica, or a combination thereof.

6. The fertilizer particle of claim 4 , wherein the filler comprises silica, dried distillers grains with solubles, or rice husk, or a combination thereof.

7. The fertilizer particle of claim 4 , wherein the pH buffering agent comprises chalk powder, CaCO 3 , MgO, KH 2 PO 4 , NaHCO 3 , Na 2 CO 3 , K 2 CO 3 , or MgCO 3 , or a combination thereof.

8. The fertilizer particle of claim 1 , wherein the shell comprises the nitrogen fertilizer.

9. The fertilizer particle of claim 1 , wherein the core further comprises a binder, a filler, or a pH buffering agent, or a combination thereof.

10. The fertilizer particle of claim 1 , wherein the urease inhibitor is comprised in the core.

11. The fertilizer particle of claim 1 , wherein the shell comprises no urease inhibitor.

12. The fertilizer particle of claim 1 , wherein the urease inhibitor is comprised in the shell and the nitrification inhibitor is comprised in the core.

13. The fertilizer particle of claim 1 , wherein the core comprises no urease inhibitor.

14. A method of fertilizing a plant, the method comprising contacting the plant, soil around the plant, or water, or a combination thereof with the fertilizer particle of claim 1 .

15. A method of manufacturing the fertilizer particle of claim 1 , the method comprising:
providing a core particle comprising the nitrification inhibitor and the nitrogen fertilizer,
providing a shell composition comprising the urease inhibitor, and contacting the core particle with the shell composition under conditions sufficient to adhere the shell composition on an outer surface of the core particle to form a solid fertilizer particle, and wherein the shell comprises no nitrification inhibitor.

Assignees

• Sabic Global Technologies Bv

Inventors

• Hegde Ravi
• Koripelly Rajamalleswaramma
• Mohana Chandra
• Achanath Radha
• Gupta Samik
• Kanagalingam Sabeshan

Classifications

• C05G5/35 Primary

  Capsules, e.g. core-shell · CPC title

• C05C9/00

  Fertilisers containing urea or urea compounds · CPC title

• C05C9/005 Primary

  Post-treatment · CPC title

• C05C11/00

  Other nitrogenous fertilisers · CPC title

• C05G3/90

  for affecting the nitrification of ammonium compounds or urea in the soil · CPC title